Which of the following instruments have both horizon glass and index glass ?1. Optical square2. Line ranger3. Box sextant4. PedometerSelect the correct answer using the code given below :

Which of the following instruments have both horizon glass and index g

1.	Which of the following instruments have both horizon glass and index glass ?1. Optical square2. Line ranger3. Box sextant4. PedometerSelect the correct answer using the code given below :
A.	2, 3 and 4
B.	1, 3 and 4
C.	1 and 3 only
D.	2 and 4 only
Answer» D. 2 and 4 only

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Which of the following instruments have both horizon glass and index glass ?1. Optical square2. Line ranger3. Box sextant4. PedometerSelect the correct answer using the code given below :

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